<?php

#
# dhpcd.leases php parsing class by peter krausgrill
#        

class Lease                    # lease
{                            #
    var $ip;                # 172.23.5.10 {

    var $starts;            # starts 5 2003/11/28 19:29:39;                -> STARTS weekday year/month/day hour:minute:second;
    var $ends;                # ends 6 2003/11/29 19:29:39;                -> ENDS weekday year/month/day hour:minute:second;
    var $hardware;            # hardware ethernet 00:0a:95:ea:2c:ea;        -> HARDWARE hardware-type mac-address;
    var $uid;                # uid 01:00:0a:95:ea:2c:ea;                    -> UID client-identifier;
    var $hostname;            # client-hostname "nyarlathotep";            -> CLIENT-HOSTNAME "hostname"; OR HOSTNAME "hostname";
    var $abandoned;            # abandoned;                                -> The DHCP server may determine that a lease has been misused in some way

                            # }

    function Lease($ip, $starts, $ends, $hardware, $uid, $hostname='', $abandoned=0)
    {
        $this->ip            = $ip;

        $this->starts        = $starts;
        $this->ends            = $ends;
        $this->hardware        = $hardware;
        $this->uid            = $uid;

        $this->hostname        = $hostname;
        $this->abandoned    = $abandoned;
    }

    function Show()
    {
        echo 
            "IP: ".$this->ip."<br>"
            ."-> MAC: ".$this->uid."<br>";
    }

}                            

class DHCPD
{
    var $filename;

    var $leases        = array();
    var $records    = array();
    var $lines        = array();

    function DHCPD($filename)
    {
        $fh = fopen($filename,"r");

        if (!$fh) exit;

        while (!feof ($fh)) 
        {
            # Get Line and strip Whitespaces
            $temp = trim(fgets($fh));

            # Ignore Comment and empty Lines
            if ($temp[0] != '#')
                $this->lines[] = $temp;
        }

        fclose ($fh);

        $this->filename = $filename;

        # Take it appart
        $this->records = split("lease", implode($this->lines));
        
        for ($i=1; $i<sizeof($this->records); $i++)
        {
            # Strip Whitespaces
            $this->records[$i] = trim(@$this->records[$i]);

            $ip = substr($this->records[$i], 0, strpos($this->records[$i]," "));

            $elements = split(";",
                            # Strip Whitespaces
                            trim(
                                # Remove Brackets IP { }
                                substr(
                                    $this->records[$i], 
                                    strpos($this->records[$i],"{") + 1, 
                                    strpos($this->records[$i],"}") - strpos($this->records[$i],"{") - 1 
                                )
                            )
                        );
            
            for ($x=0; $x<sizeof($elements); $x++)
            {
                $title = substr($elements[$x], 0, strpos($elements[$x]," "));
                $value = trim(substr($elements[$x], strpos($elements[$x]," "), strlen($elements[$x]) - strpos($elements[$x]," ") ));

                switch ( $title ) {

                    # Fixed
                    case "starts":            $starts        = split(" ",$value);    # weekday year/month/day hour:minute:second
                    case "ends":            $ends        = split(" ",$value);    # weekday year/month/day hour:minute:second
                    case "hardware":        $hardware    = split(" ",$value);    # hardware-type mac-address
                    case "uid":                $uid        = $value;

                    # Optionally
                    case "hostname":        $hostname    = substr($value,1,-1);    # "hostname"
                    case "client-hostname":    $hostname    = substr($value,1,-1);    # "hostname"
                    case "abandoned":        $abandoned    = 1;

                }

            }

            $this->leases[] = new Lease($ip, $starts, $ends, $hardware, $uid, $hostname, $abandoned+0);

        }
    }

    function Show()
    {
        echo $this->filename."<br>";
        for ($i=0; $i<sizeof($this->leases); $i++)
        {
            $this->leases[$i]->Show();
        }
    }

    function IP2MAC($ip)
    {
        for ($i=0; $i<sizeof($this->leases); $i++)
        {
            if ( ($ip == $this->leases[$i]->ip) && ($this->leases[$i]->ends[1]." ".$this->leases[$i]->ends[2] > date("Y/m/d h:i:s")) )
                return $this->leases[$i]->hardware[1];
        }

        return FALSE;
    }

    function MAC2IP($mac)
    {
        for ($i=0; $i<sizeof($this->leases); $i++)
        {
            if ( ($mac == $this->leases[$i]->hardware[1]) && ($this->leases[$i]->ends[1]." ".$this->leases[$i]->ends[2] > date("Y/m/d h:i:s")) )
                return $this->leases[$i]->ip;
        }

        return FALSE;
    }

    function MAC2HOST($mac)
    {
        for ($i=0; $i<sizeof($this->leases); $i++)
        {
            if ( ($mac == $this->leases[$i]->hardware[1]) && ($this->leases[$i]->ends[1]." ".$this->leases[$i]->ends[2] > date("Y/m/d h:i:s")) && ($this->leases[$i]->hostname) )
                return $this->leases[$i]->hostname;
        }

        return FALSE;
    }

}

?>